Live Exposure Defense: From CVE to Confirmed Exposure in 12 Hours – See more

Back
New CVE Detected

CVE-2026-18781 – Unauthenticated Remote Code Execution – Drag and Drop Multiple File Upload for Cont

Be the first to know when new zero-days emerge:

Subscribe to Email Alerts
Subscribe to RSS Feed

Summary

CVE-2026-18781 is a code injection vulnerability (CWE-94) in the "Drag and Drop Multiple File Upload for Contact Form 7" WordPress plugin. The plugin fails to validate the final filename of an uploaded file after stripping characters from it, allowing unauthenticated attackers to bypass its file-type restrictions and upload files that execute arbitrary code on the server. The flaw is rated HIGH severity with a CVSS v3.1 base score of 8.1.

Technical details

  • Root cause: the plugin strips certain characters from uploaded filenames but does not re-validate the resulting filename before accepting the upload, so the file-type/extension restriction can be bypassed.
  • Trigger condition: an attacker submits a crafted file upload (e.g., through a Contact Form 7 form using the plugin’s drag-and-drop upload field) with a filename engineered so that character stripping produces a disallowed extension (such as a server-executable script) that passes validation.
  • Attack vector: network, requiring no authentication and no user interaction, though the CVSS vector marks attack complexity as high.
  • Impact: successful exploitation allows the uploaded file to be executed on the server, resulting in full compromise of confidentiality, integrity, and availability of the affected WordPress site.

Affected software

  • Drag and Drop Multiple File Upload for Contact Form 7 (WordPress plugin): all versions before 1.3.9.9

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade the "Drag and Drop Multiple File Upload for Contact Form 7" plugin to version 1.3.9.9 or later, where filename validation after character stripping is corrected.
  • If no patch can be applied immediately: disable or remove the plugin’s file upload functionality on public-facing forms, restrict access to forms using the plugin, and monitor uploaded-file directories for unexpected executable file types until the update can be applied.

References

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report

How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report
Close

Subscribe to Threat Center RSS

Copy/paste the link below into your preferred RSS reader or follow these instructions to subscribe to Slack alerts.

Open RSS feedSlack setup instructions

Close

Get Real-Time CVE Alerts to Your Email

Be the first to know when new zero-days emerge